Eliminating porosity defects, promoting equiaxed grains and improving the mechanical properties of additively manufactured Ti-22V-4Al with super-transus hot isostatic pressing

Ng, Chi-Ho; Bermingham, Michael; Dargusch, Matthew S.

doi:10.1016/j.addma.2023.103630

Additive Manufacturing

2023

DOI: 10.1016/j.addma.2023.103630

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Eliminating porosity defects, promoting equiaxed grains and improving the mechanical properties of additively manufactured Ti-22V-4Al with super-transus hot isostatic pressing

Chi-Ho Ng

Michael Bermingham

Matthew S. Dargusch

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Cited by 4 publications

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Using defects as a ‘fossil record’ to help interpret complex processes during additive manufacturing: as applied to raster-scanned electron beam powder bed additively manufactured Ti–6Al–4V

O’Donnell,

Quintana,

Kenney

et al. 2023

J Mater Sci

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Defects in parts produced by additive manufacturing, instead of simply being perceived as deleterious, can act as important sources of information associated with the complex physical processes that occur during materials deposition and subsequent thermal cycles. Indeed, they act as materials-state ‘fossil’ records of the dynamic AM process. The approach of using defects as epoch-like records of prior history has been developed while studying additively manufactured Ti–6Al–4V and has given new insights into processes that may otherwise remain either obscured or unquantified. Analogous to ‘epochs,’ the evolution of these defects often is characterized by physics that span across a temporal length scale. To demonstrate this approach, a broad range of analyses including optical and electron microscopy, X-ray computed tomography, energy-dispersive spectroscopy, and electron backscatter diffraction have been used to characterize a raster-scanned electron beam Ti–6Al–4V sample. These analysis techniques provide key characteristics of defects such as their morphology, location within the part, complex compositional fields interacting with the defects, and structures on the free surfaces of defects. Observed defects have been classified as banding, spherical porosity, and lack of fusion. Banding is directly related to preferential evaporation of Al, which has an influence on mechanical properties. Lack-of-fusion defects can be used to understand columnar grain growth, fluid flow of melt pools, humping, and spattering events. Graphical abstract

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Using defects as a ‘fossil record’ to help interpret complex processes during additive manufacturing: as applied to raster-scanned electron beam powder bed additively manufactured Ti–6Al–4V

O’Donnell,

Quintana,

Kenney

et al. 2023

J Mater Sci

View full text Add to dashboard Cite

show abstract

Enhancing Mechanical Performance of Sinter-Based Additively Manufactured Ti-6Al-4V Parts Through Hydrogen Sintering and Phase Transformation (HSPT) Process

Jump,

Sun,

Zhou

et al. 2024

Metall Mater Trans A

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Defect recrystallization in subtransus hot isostatic pressing of electron beam powder bed fusion Ti-6Al-4V

Saville,

Benzing,

Semiatin

et al. 2024

Additive Manufacturing

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Eliminating porosity defects, promoting equiaxed grains and improving the mechanical properties of additively manufactured Ti-22V-4Al with super-transus hot isostatic pressing

Cited by 4 publications

References 44 publications

Using defects as a ‘fossil record’ to help interpret complex processes during additive manufacturing: as applied to raster-scanned electron beam powder bed additively manufactured Ti–6Al–4V

Using defects as a ‘fossil record’ to help interpret complex processes during additive manufacturing: as applied to raster-scanned electron beam powder bed additively manufactured Ti–6Al–4V

Enhancing Mechanical Performance of Sinter-Based Additively Manufactured Ti-6Al-4V Parts Through Hydrogen Sintering and Phase Transformation (HSPT) Process

Defect recrystallization in subtransus hot isostatic pressing of electron beam powder bed fusion Ti-6Al-4V

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